19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The RMS speed of helium in ms-1 (atomic mass = 4.0 g mol-1) at 400 K is (EAMCET 2014)
The intermolecular interaction that is dependent on the inverse cube of distance between the molecules is: (WB JEE 2015)
Two closed bulbs of equal volume (V) containing an ideal gas initially at pressure Pi and temperature T1 are connected through a narrow tube of negligible volume as shown in the figure below. The temperature of one of…
A 100 mL flask contained H 2 at 200 torr and a 200 M flask contained He at 100 torr. The two flasks were then connected so that each gas filled their combined volume Assume, no change in temperature, total pressure is…
Assertion: The graph between Pv/s V is a straight line. Reason: For adiabatic process, P 1/V (AIIMS 2019)
The volume occupied by 1.8 g of water vapour at 374°C and 1 bar pressure will be [Use R = 0.083 bar L K-1 mol-1] (NEET (Odisha) 2019)
Which one is not correct mathematical equation for Dalton's Law of partial pressure? Here p = total pressure of gaseous mixture (NEET 2022)
A 10.0 L flask contains 64 g of oxygen at 27°C. (Assume O2 gas is behaving ideally). The pressure inside the flask in bar is (Given R = 0.0831 L bar K-1 mol-1) (NEET 2022)
Match the Column I with Column II and choose the correct option from the codes given below: Column I Column II A. Biodegradable pollutant(s) B. Non-Biodegradable pollutant(s) 1. Nuclear wastes 2. Plastic 3. Discard…
Which one of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere? (AIPMT 2004)
Nitrogen oxides produced from the presence of (KET 2004)
The smog is essentially caused by the presence of : [Guj. CET 2004]
The basic components of the smog are (AMU 2005)
Use of chlorofluorocarbon is not encouraged because (KCET 2005)
The water pollutants mainly responsible for eutrophication are (Punjab PMET 2006)
Match the column I and column II and pick the correct matching from the codes given below. (Kerala CEE 2006) Column I Column II A. Peroxyacetyl nitrate 1. Waste incineration B. Polycylic aromatic 2. Global warming C…
Which of the following is secondary pollutant? (Manipal 2007)
The brown haze of photochemical smog is largely attributable to (Punjab PMET 2007)
Which one of the following compounds helps in achieving equilibrium between O2 and CO2 in atmosphere? (EAMCET 2008)
Green chemistry means such reactions which : (AIPMT 2008)
Freon gas causing stratospheric ozone depletion is mainly released from : (WB CET 2008)
The process of ‘eutrophication’ is due to the (Kerala CEE 2008)
5L aqueous solution is kept in the presence of oxygen and suitable microorganism for five days at 20°C. If the O2 consumed is 0.2g, the BOD value of the sample is (EAMCET 2008)
Assertion (A): London smog is oxidising in nature. Reason (R): London smog contains O3, NO2 and hydrocarbons. (AIIMS2009)
Photochemical smog is caused due to the presence of (Kerala CEE2009)